The best match for a 36 x 75 foam mattress is the Foamma 6-inch model, which lists those exact dimensions and includes an organic cotton cover. For a close-length RV or truck replacement, consider the FoamRush 6-inch mattress, but note that it is 36 x 76 inches. The other choices offer different thicknesses or standard twin-size formats, so verify their actual dimensions before buying for a narrow bunk or built-in frame.
| Mattress | Listed size or thickness | Best for |
|---|---|---|
| Foamma Gel Memory Foam | 6 x 36 x 75 inches | Exact listed size with a cover |
| FoamRush Truck Mattress | 6 inches; 36 x 76 inches | Truck, camper, or RV replacement |
| FoamRush Bunk Mattress | 3 inches | Buyers seeking a thinner bunk option |
| Lucid Gel Memory Foam | 5 inches; twin size | Firm gel foam in a standard size |
| Kin by Tuft & Needle | 8 inches; twin size | Buyers seeking an 8-inch adaptive-foam mattress |
Foamma 6-Inch Gel Memory Foam Mattress
This is the most direct match for a 36 x 75 search: the product name lists a 6-inch thickness and 36 x 75-inch dimensions. It combines medium-firm foam with gel memory foam and includes an organic cotton cover. The listing describes it as a mattress replacement for RV bunks, campers, trucks, and travel trailers, and identifies it as CertiPUR-US certified and made in the USA.
Best for: Buyers who need the specified 36 x 75 footprint and want a cover included. Why it stands out: Its listed length and width match the search exactly, and it is intended for vehicle and RV sleeping spaces. Limitation: The 6-inch thickness may not suit a frame with less vertical clearance; measure the available space first.
FoamRush 6-Inch Truck Mattress
This medium-firm gel memory foam mattress is listed at 36 x 76 inches, making it one inch longer than the requested 36 x 75 size. It is described as a replacement for a truck, camper, RV, or travel trailer and is made in the USA. Its listed features include comfort pressure relief.
Best for: Buyers whose sleeping platform can accommodate a 36 x 76 mattress. Choose this if a one-inch length difference is acceptable for your frame and you prefer a 6-inch medium-firm foam option. Limitation: The listing says the cover is not included, and the dimensions are not an exact 36 x 75 match.
FoamRush 3-Inch Bunk Mattress
This FoamRush replacement offers a 3-inch profile and options for gel memory foam or high-density foam. The product listing also describes medium-firm or firm options, pressure-relief support, and foam and cover options. It is made in the USA and is positioned for RV bunk use.
Best for: RV bunk owners looking for a thinner mattress than the 5-, 6-, or 8-inch options in this selection. Why it was selected: Its bunk-replacement focus and selectable foam types are relevant to compact sleeping spaces. Limitation: The supplied listing does not specify a 36 x 75 dimension, so confirm the selected configuration’s measurements before ordering.
Lucid 5-Inch Firm Gel Memory Foam
The Lucid is a 5-inch firm gel memory foam mattress in twin size. Its listed features include bamboo charcoal and cooling gel, fiberglass-free construction, bed-in-a-box packaging, and CertiPUR-US certification.
Best for: Buyers who want a firm, thinner gel memory foam mattress and are comparing alternatives to custom RV sizes. Why it was selected: Its 5-inch profile sits between the thinner bunk choice and the thicker options. Limitation: The product is identified as twin size, not 36 x 75; do not assume it will fit a narrow platform without checking the exact dimensions.
Kin By Tuft & Needle 8-Inch Mattress
This 8-inch firm adaptive-foam mattress is listed in twin size. The product information identifies CertiPUR-US certification, cooling performance, and manufacture in the USA with global components. It also lists a 10-year limited warranty and a 100-night trial.
Best for: Buyers seeking a thicker, firm foam mattress for a space that can accept its twin-size dimensions. Why it was selected: It provides a distinct 8-inch adaptive-foam alternative to the gel memory foam options. Limitation: Twin size is not the same as a confirmed 36 x 75 fit; verify measurements and frame clearance.
Buying Guide
How exact does the mattress size need to be?
Measure the platform’s inside width and length, rather than relying only on a mattress label. A snug fit may be important on an RV bunk or truck platform, while a mattress that is too long may not lie flat. Of these options, only the Foamma product explicitly lists 36 x 75 inches. The FoamRush truck model lists 36 x 76 inches.
Which thickness should you choose?
Compare mattress thickness with the frame, surrounding trim, and available headroom. The listed choices range from 3 to 8 inches. A thinner mattress may be necessary where clearance is limited; a thicker mattress changes the height of the sleeping surface. Check the mattress’s full listed dimensions before selecting a model.
Do you need a cover?
Check what is included before ordering. The FoamRush 6-inch truck mattress listing says the cover is not included. The Foamma product name specifies an organic cotton cover, while the 3-inch FoamRush listing describes cover options. Confirm the configuration details for the option you select.
Should you choose gel memory foam or adaptive foam?
Choose based on the listed construction and your preference for firmness. The FoamRush and Foamma models include gel memory foam, while the Kin product is described as adaptive foam. The 3-inch FoamRush offers high-density foam as another listed option. Product names and features do not establish a guaranteed comfort experience for every sleeper.
Frequently Asked Questions
Which listed mattress is exactly 36 x 75 inches?
The Foamma 6-inch mattress explicitly lists dimensions of 36 x 75 inches.
Is a 36 x 76 mattress the same as 36 x 75?
No. The FoamRush truck mattress is listed as one inch longer. Measure the frame to determine whether it can accommodate that size.
Does the FoamRush truck mattress include a cover?
No. Its product name states that a cover is not included.
Are the twin mattresses confirmed to fit a 36 x 75 bunk?
No. The Lucid and Kin products are described as twin size, but the supplied product information does not confirm a 36 x 75 fit. Check their exact dimensions before buying.
What should I measure before ordering?
Measure the platform’s inside length and width, plus the maximum thickness it can accept. Also account for surrounding edges or trim that could restrict the mattress.